Ultrasound

Ultrasound (also called sonogram) is a prenatal test offered to pregnant women. It uses sound waves to show pictures of your baby in the uterus and can help your healthcare provider check on your baby's health and development.

There are several ultrasound markers for Down syndrome which can be seen on sonogram during pregnancy and which can possibly indicate an increased risk for the fetus having Down syndrome.
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Ultrasounds
have been used for more than 50 years to take images of the human body
for diagnostic use. During pregnancy, women are often given at least one
ultrasound to record fetal growth, number, orientation and development.
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Although certain harmful effects in cells are observed in a laboratory setting, abnormalities in embryos and offsprings of animals and humans have not been unequivocally demonstrated in the large amount of studies that have so far appeared in the medical literature purporting to the use of diagnostic ultrasound in the clinical setting.
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The ventricles are fluid-filled spaces in the brain. The two major ventricle are the lateral ventricles. A lateral ventricle that's over 10 mm in size is usually considered enlarged (ventriculomegaly).
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